Search Publications
Ephemeris, orbital decay, and masses of ten eclipsing high-mass X-ray binaries
Bonnet-Bidaud, J. M.; Lutovinov, A.; Bozzo, E. +3 more
We update the ephemeris of the eclipsing high-mass X-ray binary (HMXB) systems LMC X-4, Cen X-3, 4U 1700-377, 4U 1538-522, SMC X-1, IGR J18027-2016, Vela X-1,IGR J17252-3616, XTE J1855-026, and OAO 1657-415 with the help of more than ten years of monitoring these sources with the All Sky Monitor onboard RXTE and with the Integral Soft Gamma-Ray Im…
Anatomy of the AGN in NGC 5548. I. A global model for the broadband spectral energy distribution
Kaastra, J. S.; Harrison, F. A.; Kriss, G. A. +24 more
An extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption. Our observations taken in 2013-2014 with XMM-Newton, Swift, NuSTAR, INTEGRAL, Chandra, HST and two ground-based observatories have together enabled us to establish that this unexpected phenom…
Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni
Greiner, J.; Mas-Hesse, J. M.; Tomsick, J. A. +20 more
After 25 years of quiescence, the microquasar V404 Cyg entered a new period of activity in June 2015. This X-ray source is known to undergo extremely bright and variable outbursts seen at all wavelengths. It is therefore an object of prime interest to understand the accretion-ejection connections. These can, however, only be probed through simulta…
Hierarchical progressive surveys. Multi-resolution HEALPix data structures for astronomical images, catalogues, and 3-dimensional data cubes
Boch, T.; Fernique, P.; Pineau, F. -X. +8 more
Context. Scientific exploitation of the ever increasing volumes of astronomical data requires efficient and practical methods for data access, visualisation, and analysis. Hierarchical sky tessellation techniques enable a multi-resolution approach to organising data on angular scales from the full sky down to the individual image pixels.
Aims…
SN2014J gamma rays from the 56Ni decay chain
Wang, Wei; Diehl, Roland; Greiner, Jochen +7 more
Context. The detection and measurement of gamma-ray lines from the decay chain of 56Ni provides unique information about the explosion in supernovae. SN2014J at 3.3 Mpc is a sufficiently-nearby supernova of type Ia so that such measurements have been feasible with the gamma-ray spectrometer SPI on ESA's INTEGRAL gamma-ray observatory. <…
Mass without radiation: Heavily obscured AGNs, the X-ray background, and the black hole mass density
Marconi, A.; Gilli, R.; Comastri, A. +2 more
A recent revision of black hole scaling relations indicate that the local mass density in black holes should be five times higher than previously determined values. The local black hole mass density is connected to the mean radiative efficiency of accretion through the time integral of the Active Galactic Nuclei (AGN) volume density and a signific…
Hard X-ray polarimetry with Astrosat-CZTI
Rao, A. R.; Bhattacharya, D.; Vadawale, S. V. +5 more
X-ray polarimetry is largely an unexplored area of an otherwise mature field of X-ray astronomy. Except for a few early attempts during the 1970s, no dedicated X-ray polarimeter has been flown during the past four decades. On the other hand, the scientific value of X-ray polarization measurement has been well known for a long time, and there has b…
Revisiting INTEGRAL/SPI observations of 44Ti from Cassiopeia A
Diehl, Roland; Greiner, Jochen; Siegert, Thomas +1 more
Context. The 340-yr old supernova remnant Cassiopeia A, located at 3.4 kpc distance, is the best-studied young core-collapse supernova remnant. Nucleosynthesis yields in radioactive isotopes have been studied with different methods, in particular for production and ejection of 44Ti and 56Ni, which originate in the innermost r…
Lepto-hadronic model for the broadband emission of Cygnus X-1
Romero, Gustavo E.; Pepe, Carolina; Vila, Gabriela S.
Context. Cygnus X-1 is a well-observed microquasar. Broadband observations at all wavelengths have been collected over the years. The origin of the MeV tail observed with COMPTEL and INTEGRAL is still under debate and it has mostly been attributed to the corona, although its high degree of polarization suggests that it is synchrotron radiation fro…
Anatomy of the AGN in NGC 5548. III. The high-energy view with NuSTAR and INTEGRAL
Harrison, F.; Kriss, G. A.; Bianchi, S. +15 more
We describe the analysis of the seven broad-band X-ray continuum observations of the archetypal Seyfert 1 galaxy NGC 5548 that were obtained with XMM-Newton or Chandra, simultaneously with high-energy (>10 keV) observations with NuSTAR and INTEGRAL. These data were obtained as part of a multiwavelength campaign undertaken from the summer of 201…